(Spoiler) This movie may not have stopped nuclear war, but....
... I think it may have had a part in changing laws requiring that refrigerators should not be made with latching doors.
I was a grade school kid in the late 1960s and I remmber on at least a couple of occasions parents and teachers making a huge deal about the dangers of refrigerators and freezers -- I wonder if this movie might have raised public awareness of the danger.
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4) You ever seen Superman $#$# his pants? Case closed.